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United States Patent | 5,067,306 |
Umezawa | November 26, 1991 |
A process for providing easy-opening of a sealed and packed bag by means of an automatic bag-making packer involves pressing on a side margin of an outermost turn of a roll of film a cylindrical surface of a cutting roller mounted in the automatic bag-making packer, the cylindrical surface of the cutting roller having multiple edged projections for forming microcuts in the side margin, so that a resulting sealed and packed bag is easily opened from a side margin of the sealed and packed bag without reducing the mechanical strength of a film constituting the sealed and packed bag. An automatic bag-making packer embodying the process includes a cutting roller, an outer cylindrical surface of which has edged projections, the cutting roller being in close contact with a point on a top surface of an outermost turn of a roll of film mounted on a hollow cylindrical roll core made of paper, the cutting roller rotating and pressing on a side margin of the outermost turn as the film is fed from the roll of film, and a positioning roller adjacent the cutting roller to prevent transverse movement of the roll of film while the cutting roller presses on the side margin of the outermost turn thereof.
Inventors: | Umezawa; Kazumi (Tokyo, JP) |
Assignee: | Asahi Chemical Polyflex Co., Ltd. (Tokyo, JP) |
Appl. No.: | 531996 |
Filed: | June 1, 1990 |
Jun 02, 1989[JP] | 1-139075 |
Current U.S. Class: | 53/412; 53/133.8; 53/389.3; 53/389.4; 53/451; 53/551; 83/660 |
Intern'l Class: | B65B 061/18 |
Field of Search: | 53/133,141,389,412,450,451,477,550,551,552,133.8,389.3,389.4 83/660,677,678,886 156/250,251,252,257 383/100,101,103,109 493/363,364,365,930,963 |
3021732 | Feb., 1962 | Schur | 83/660. |
3083876 | Apr., 1963 | Schneider et al. | 53/133. |
3212381 | Oct., 1965 | Heyer | 83/678. |
3390507 | Jul., 1968 | Repko | 53/412. |
3399760 | Sep., 1968 | Hechler | 206/65. |
3642126 | Feb., 1972 | Kurtz et al. | 206/6. |
4543279 | Sep., 1985 | Kai | 428/35. |
4567986 | Feb., 1986 | Eastwood | 206/532. |
4778058 | Oct., 1988 | Yamazaki et al. | 206/610. |
4919272 | Apr., 1990 | Kai et al. | 206/610. |